Ocular congestion can be caused by many factors, so the first step is to identify the cause based on the clinical presentation as well as a specialist examination. Ocular congestion may manifest as conjunctival congestion, ciliary congestion, or a mixed manifestation of congestion. Conjunctival congestion refers to the dilatation of conjunctival blood vessels without exudation or bacterial infiltration and is generally dominated by the conjunctival congestion near the fornix, most commonly seen in conjunctivitis, and can also be caused by environmental factors. Ciliary congestion, on the other hand, is characterized by congestion of the blood vessels near the edge of the black eye and may be accompanied by loss of vision, with a very indistinct pattern of blood vessels, so it is usually seen in conjunctivitis, keratitis, iridocyclitis, scleritis, glaucoma, etc. Therefore, the key to treatment is to identify the cause. If it is caused by conjunctivitis, consider symptomatic anti-infection treatment, such as bacterial infection caused by conjunctivitis, need antibiotic eye drops and eye ointment treatment; if it is viral conjunctivitis, need to use antiviral eye drops; if it is allergic conjunctivitis, need anti-allergy treatment, and so on. If it is caused by glaucoma, it needs timely IOP lowering treatment, and if it is caused by iridocyclitis, it also needs to be treated with dilating eye drops and hormonal eye drops.